libmusicbrainz is a client library for accessing the MusicBrainz database
allowing metadata lookup for audio files. This is version 4.x which supports
version 2 of the XML Web Service.
WWW: http://musicbrainz.org/

- Use LATEST_LINK instead of defining the version in PORTNAME
- while I'm here, respect LOCALBASE and thus remove needless dependency
on pkg-config. pkg-config is often used by cmake as auxiliary tool
to populate search paths. Until stuff is located at standard location,
there is no need for pkg-config utility. [1]
PR: ports/169904
Submitted by: Jason E. Hale (maintainer)
Approved by: maintainer via irc [1]